const crypto = require('crypto')

class HttpError extends Error {
  constructor(status, message) {
    super(message)
    this.status = status
  }
}

function uid(prefix) {
  return `${prefix}${Date.now().toString(36)}${crypto.randomBytes(2).toString('hex')}`
}

function token() {
  return crypto.randomBytes(24).toString('hex')
}

function ok(res, data) {
  res.json({ ok: true, data })
}

function fail(res, status, message) {
  res.status(status).json({ ok: false, message })
}

// Express 4 does not forward rejected promises to the error handler.
function wrap(handler) {
  return (req, res, next) => Promise.resolve(handler(req, res, next)).catch(next)
}

function str(value, max) {
  const text = value == null ? '' : String(value).trim()
  return max ? text.slice(0, max) : text
}

function has(body, key) {
  return Object.prototype.hasOwnProperty.call(body || {}, key)
}

const PHONE_RE = /^1\d{10}$/

module.exports = { HttpError, uid, token, ok, fail, wrap, str, has, PHONE_RE }